High Explosive Squash Head (HESH) in British terminology, or High Explosive Plastic/Plasticized (HEP) in American terminology, is a type of explosive projectile which utilizes a plastic explosive that conforms to the surface of a target before detonating to improve the transfer of explosive energy to the target. Squash head projectiles are similar to high explosive projectiles and are well suited to many of the same targets. However, while HESH projectiles are not armor-piercing, they are capable of defeating armored targets by causing spall which can injure or kill a vehicle's occupants.
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